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Final Hours To Save Up To 40% | Shop Now

AT3 Tactical 5.56 NATO AR-15 Parts

5.56 AR-15 parts by AT3 Tactical, from BCGs to muzzle devices, and any AR part your rifle needs in between.

Showing 1–24 of 66 results

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AT3™ AR-15 Bolt Carrier Group - 5.56 NATO/.300 Blackout - Black Nitride

(195)

AT3™ AR-15 Bolt Carrier Group Black Nitride – .223/5.56 NATO .300 Blackout .350 Legend

Sale!

(1)

AT3 Tactical AR-15 Barrel – 16″ – 5.56 NATO – Government Profile – Mid-length

Sale!

AT3 Tactical AR-15 Barrel – 10.5″ – 5.56 NATO – Government Profile – Carbine Length

Sale!

AT3™ Mil Spec Buffer Tube Kit For AR-15

(93)

AT3™ Mil Spec Buffer Tube Kit For AR-15 – 9 Colors Available

Sale!

AT3 Tactical Extractor for .223/5.56 Bolts - Black Nitride

(1)

AT3 Tactical Extractor for .223/5.56 Bolts – Black Nitride

Sale!

AT3 Flatline AR-15 Rifle

(1)

AT3™ AT-15 FLATLINE Rifle 16 Inch 5.56 NATO – 15 Inch M-LOK Handguard

Sale!

AT3 Spear M-LOK Handguard with Cerakote Finishes - 7 Colors

(729)

AT3™ SPEAR Free Float AR-15 Handguard – 9, 12, & 15 Inch – M-LOK

Sale!

AT3 Tactical Pro Quad Rail AR-15 Handguard with Cerakote Finishes

(309)

AT3™ Pro Quad Rail Free Float AR-15 Handguard – 7, 9, 12, & 15 Inch – Picatinny

Black Warhammer with BCG

(55)

AT3™ Black Nitride 5.56 Bolt Carrier Group with Breek Arms Warhammer AR-15 Charging Handle

RECOMMENDED

AT3 Tactical AT-15 M-LOK Builder Set - Lower, Upper, and SPEAR M-LOK Handguard

(9)

AT3™ AT-15 M-LOK Builder Set – Anodized and Cerakote

RECOMMENDED

AT3 Tactical AT-15 Quad Rail Builder Set - Lower, Upper, and Pro Quad Rail Handguard

(6)

AT3™ AT-15 Quad Rail Builder Set – Anodized and Cerakote

AT3 AR-15 Billet Upper and M-LOK Handguard with Cerakote Finishes - 7 Colors

(164)

AT3™ AR-15 Upper Receiver and SPEAR Handguard Combo

RECOMMENDED

AT3 Tactical 3-Port Muzzle Brake

(57)

AT3™ AR-15 3-Port Muzzle Brake – 1/2×28 – 5.56 NATO – Crush Washer Included

AT3 Tactical Crush Washer - 1/2 Inch for 5.56/.223

(13)

AT3™ 1/2 Inch Crush Washer for .223/5.56 Muzzle Devices Compatible with AR-15

Spare 5.56 Bolt in Black Nitride

(9)

AT3™ AR-15 Replacement Bolt – 5.56 NATO/.300 Blackout – Black Nitride

AT3 Tactical 3-Port Muzzle Brake

(25)

AT3™ AR-15 3-Port Muzzle Brake – 5/8×24 – .300 BLK/.308 Win – Crush Washer Included

AT3 Tactical Billet Upper and Pro Quad Rail AR-15 Handguard Combo with Cerakote Finishes

(19)

AT3™ AR-15 Upper Receiver and Pro Quad Rail Handguard Combo

AT3 Tactical 16 Inch 5.56 NATO Lightweight Complete AR-15 Upper Assembly - No BCG or Charging Handle

(10)

AT3™ Assembled AR-15 Upper – .223/5.56 16″ Ballistic Advantage Barrel – No BCG/CH

Slick Side Upper with Ambi Charging Handle and Bolt Carrier Group

(2)

AT3™ Slick Side Upper with Bolt Carrier Group and Breek Arms Warhammer Charging Handle

Black Upper with BCG

(11)

AT3™ Slick Side AR-15 Upper with Black Nitride 5.56 Bolt Carrier Group

AT3™ AR-15 A2 Mil-Spec Flash Hider with Crush Washer

(31)

AT3™ AR-15 A2 Mil-Spec Flash Hider – 1/2×28 – 5.56 NATO – Crush Washer Included

AT3 Complete .223 Wylde Match Grade Upper Faxon Heavy Fluted Barrel

(4)

AT3™ Assembled Match Grade AR-15 Upper – .223 Wylde 16 Inch Faxon Firearms Barrel – No BCG/CH

AT3 Alternator AR-15 Pistol

AT3™ AT-15 ALTERNATOR Pistol 10.5 Inch 5.56 Barrel – 12 Inch M-LOK Handguard

(5)

AT3 Tactical™ AR-15 Compensator – 1/2×28 – 5.56 NATO – Crush Washer Included